JSON数据传输后台拿不到，求大神指点

Question

后台代码
@RequestMapping(value="adduser")
@ResponseBody
public void adduser(String user){
System.out.println("添加");
User users=JsonUtil.deserialize(user, User.class);
System.out.println(users+"===");
}

前台代码
function register(){
alert($('.username').val()+"---");
var user={"username":$('.username').val(),"password":$('.password').val()};
alert(user.username);
$.ajax({
cache: false,
type: "POST",
dataType:'json',
url:"../../user/adduser", //把表单数据发送到userController
contentType: "application/json; charset=utf-8",
data:user, //要发送的是ajaxFrm表单中的数据
async: false,
success:function(msg){

            }

        });
        alert("注册")
    }

Answer 1

外面价格单引号看看

{"username":$('.username').val(),"password":$('.password').val()}